Muffle for the distillation of zinc.



'No Drawing TED. SAT .1

MAX ENGELS, OF WESTEND, NEAR BERLIN, GERMANY.

MUFFLE FOR THE DISTILLATION 0F ZINC.

To all whom it may concern Be it known that I, Dr. MAX ENenLs, a citizen of the German Empire, residing at Westend, near' Berlin, Germany, have invented certain new and useful Improvements in Muflies for the Distillation of Zinc, of which the following is a specification.

This invention relates to a muflie for the distillation of zinc which is at the same time comparatively cheap in its manufacture and durable in use. e

To this end the new muflle consists of a mixture of clay and fire-proof material containing a small proportion of zirconia.

Good results have been obtained with muflies consisting of about 33 partsin weight of clay, 62 parts of fire-clay and 5 parts of zirconia. Such muffles are remarkably more durable than the usual muflies consisting of about 33 parts of clay and 67 parts of fireclay. It is however understood that increase in durability over the usual muffles consisting-of clay and fire-clay'alone is confined to a comparatively small proportion in zirconia contained in the muflle material. If larger proportions of fire-clay in the usual Specification of Letters Patent.

Patented Apr. 2Q), 1915.

Application filed February 11, 1915. Serial m. 7,653.

nuflle. composition are substituted by zirconia, the increase in durability ceases and I deterioration sets in. 'lhe contents in zirconia should not exceed 10 per cent. However it is not necessary to strictly adhere to a proportion of 5% in zirconia. Good results are still obtained with smaller contents in zirconia and it has been found that DR. MAX ENGELS.

- Witnesses:

WOLDEMAR HAUPT, HENRY HAsrER. 

